The Grayl Ultralight is here!

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I remember a long time ago, while traveling through China, where I saw a guy with a garbage bag full of disposable plastic water bottles, refilling them from a bathroom sink. So not only does bottled water come with a 280,000% markup, but sometimes it’s not even good.

And if you thought this was something that happens just in sketchy bus stations in China, you’d be wrong. About 25% of bottled water in the US is just tap water. Sometimes filtered, sometimes not.

As someone who enjoys budget travel to out-of-the-way destinations, I’ve spent the last several years keeping an eye on simple, portable, reliable water filters, preferably contained entirely within a bottle, that can handle the sorts of contaminants commonly found in chemically-flavored tap water, bacteria-filled mountain streams, and virus-hiding third world village wells. The number of convenient options that can handle all three of these challenges is, like…five or sixIn the world.

So that’s why I was so glad to see a new one show up on the scene a few years ago, which can handle all of those challenges just fine, without requiring any awkward hoses, breakable mechanical pumps, slow-flow straw sucking, or any other nuisance like that. It’s called the Grayl, and it works just like a French press. Fill it up, press the filter, and drink. That’s it.

When I reviewed the original version of the Grayl, I mentioned that its filtration capabilities were as good as anything you can find, with a cost-effectiveness on par with industry heavyweights that have been around for years, and a simplicity (and elegance) that you’re not likely to see anywhere else. The only potential issue, especially for lightweight backpacking, was that it was pretty heavy, coming it at about 20.75 ounces.

Enter the Grayl Ultralight, the update that solves the only real problem the original ever had. It offers the same great filtration performance, using BPA-free plastic to bring the weight down to 10.9 ounces. It feels like a totally different product now. Grayl gave me a couple test samples and spare filters, and, given how it’s currently doing on Kickstarter, there are a lot of people just as happy with it as I am.

If you’re familiar with the original, you already know how it works, as they function identically. But if you’re new to the scene, all that info is in here too.

The Grayl Ultralight, in review

Here it is:

Grayl Ultralight colors
Available in stoic grey, and mountain rescue safety orange.


  • Height: 9.625″ (24.5 cm)
  • Width: 2.875″ (7.3 cm)
  • Weight (empty): 10.9 oz (309 g)
  • Weight (full): 30 oz (850 g)
  • Capacity: 16 oz (0.473 L)
  • Filter lifespan: 300 uses (40 gallons/150 L)
  • Estimated Retail Price: $60 (includes one top-of-the-line Travel filter)

The big story here is the weight, which is about half as much as the original stainless steel version. For reference, a stainless steel Klean Kanteen of similar capacity is about 6 ounces (170 g), so the difference between having a filter and not having a filter is a mere 5 ounces. That’s about the weight of an average men’s t-shirt.

But as an added bonus, it’s also estimated that it’s going to retail for $30 less than the original stainless steel Grayl (now called the Legend), and $20 less than the hybrid steel/plastic version (known as the Quest). For lightweight backpackers on a budget, this is a win-win.

Filtration performance

I’m going to segue into a minor lesson on filtration and general water-related safety for a moment. The way I look at it, there are three broad categories you need to worry about when it comes to water quality:

  • Particles, whether it’s dirt, dust, or sediment, but also heavy metals and chemicals, like lead, arsenic, chlorine, and many others. These can be found in ordinary tap water, and certain rivers, or lakes, and so on. Most carbon filters can handle this, and it’ll also make the water taste nice and clean.
  • Bacteria, like E. Coli and Salmonella, but also bacterially-sized things, like protozoan cysts, such as giardia and cryptosporidium. I group these together, because if a filter can handle bacteria, it can handle the others. You’ll need something that can handle this category (and most likely the previous one) if you’re hiking or otherwise enjoying the great outdoors.
  • Viruses, which is where many filters fall short. They’re significantly smaller than bacteria, which means you need a much better filter to handle them. Oh, and when people say their filter can remove viruses, you want actual numbers. If someone says “hey, we remove viruses!” but don’t say how many, that’s probably a bad sign. You won’t run into viruses if you’re just hiking around in a modern country, but if you’re heading someplace like rural Africa or the Amazonian jungle, you’ll want something that can handle this category (and the previous two).

Conveniently, Grayl’s filters come in exactly these options:

Grayl Ultralight filter options
With color-coded simplicity.

From left to right, those are the Tap, Trail, and Travel filters, conveniently named for exactly what they can handle. The Tap filter is for filtering water at home (filtering particles); the Trail filter is for outdoor hiking (filtering particles and bacteria); and the top-of-the-line Travel filter is for international travel (filtering particles, bacteria, and viruses), or for any seriously questionable water source.

This allows you to use only the filter you need, such as using the Tap filter at home, and swap it out for a Travel filter when you’re heading off to the Sahara or someplace like that. Each filter lasts 300 uses, or 40 gallons (150 L), and will slow down when it’s time to replace it.

Update: Grayl has streamlined the replacement filter options, and now offers either the Tap filter or the top-of-the-line Travel filter (which has been renamed the Purifier). A lot of customers were asking which filter was appropriate for which situation, and this way they don’t have to worry. Use the tap filter at home, and the purifier for everywhere else. As an added bonus, they’ve dropped the Purifier price from $40 to $25.

Here’s the performance of each:

Tap filter ($15) removes:

  • Chemicals and metals, such as chlorine, iodine, lead, arsenic, and others. Also improves flavor and odor.

Trail filter (discontinued) removes:

  • Chemicals and metals, such as chlorine, iodine, lead, arsenic, and others. Also improves flavor and odor.
  • 99.99% of bacteria
  • 99.94% of protozoan cysts

Travel filter ($25) removes:

  • Chemicals and metals, such as chlorine, iodine, lead, arsenic, and others. Also improves flavor and odor.
  • 99.9999% of bacteria
  • 99.999% of protozoan cysts
  • 99.9999% of viruses

Yes, count up those 9s on the end. I am not aware of any filter that matches this level of performance (most of them don’t bother filtering viruses at all), and even fewer that also offer the convenience of a bottle, which, if you haven’t tried it, is the only way to go.

Using the Grayl

Nothing says “elegant simplicity” like a minimum of components.

Grayl Ultralight components
Outer cup, inner cup, lid, and filter.

Just fill it up:

Grayl Ultralight filling


Grayl Ultralight pressing

And drink:

Grayl Ultralight drinking

It’s really just that simple. There’s no pump to break; no batteries can run out; no iodine to ruin the taste; no hose to uncoil and put away afterwards; no bag to hang up on a branch; no bulb to replace; no straw to hold onto the grime that gets stuck inside…no nothing. Just a few simple components that are easy to use, easy to disassemble, and easy to clean.

The only alternatives that can remotely match this ease of use are the soft-sided bottled filters that use a straw, and you suck the water through the straw while squeezing the bottle to get the water through the filter. It works, but the flow rate is pretty slow, which is agonizing when you’re trying to rehydrate on a hot day. And sometimes those bottles inexplicably use stainless steel, so you can’t squeeze the bottle to increase the flow rate. All you can do is suck. And that really sucks.

Since the Grayl presses the water through the filter all at once, you don’t have to deal with any of that, so drinking from it is just as easy as drinking a glass of water. It does take some extra effort ahead of time, since you have to press the water through the filter (it’s good to press against a low coffee table, or kneel down and press it against the ground, so you can use your body weight to make it easier), but the 15-30 seconds it takes to press the Travel filter means no sucking and squeezing later, and the Tap and Trail filters go even faster.

You know what else is great? You can pour the clean water into another container.

Grayl Ultralight pouring
So simple…

That’s generally out of the question for the suck/squeeze bottled filters, which means you can share a single Grayl between multiple people, or use it to fill extra bottles for backup. You could do the same thing with pump/hose filters, but the Grayl Ultralight is lighter, simpler, and has a lower upfront cost.

Minor improvements to this version

Compared to the original stainless steel Grayl Legend, the Ultralight has a couple design changes that fix minor usage issues.

1) Straighter

Notice how the stainless steel version can tilt a bit as you close it, whereas the Ultralight stands up straighter:

Grayl tilting
Admittedly, it’s pretty subtle.

With the stainless version, it’s possible for the lower cup to “bite” into that blueish rubbery band, whereas the Ultralight won’t do that. This is partly due to the extra thickness of the plastic, which keeps it much straighter, plus that 90 degree angle where the outer cup meets the seal. There’s nothing to get in the way.

2) Grippier

That rubbery band is also bigger than before, jutting outward just a bit, rather than being recessed slightly, providing a non-slip grip for your thumb and forefinger. The plastic used in the bottle is also a bit textured, so it’s fairly grippy as well, and the textured surface also cuts down on condensation building up and dripping down the sides if the water inside is too cold.

3) Clippier

Lastly, the new lid can hook into a carabiner:

Grayl Ultralight carabiner attachment
Yes, yes, S-shaped carabiners are cooler, but this is what I had.

This is great for clipping it onto the side of a backpack, usually through the compression strap that tends to be over there, or you could loop a shoulder strap through it and carry it by itself, without needing a daypack.

There’s some discussion of maybe designing an alternate cap with a smaller drink spout, which would make it easier to drink while moving on a shaky bus, or riding a bike. I’m looking forward to seeing something like that at some point, but in the meantime, this is quite simple, lightweight, and carabiner-compatible. It also doesn’t take that many rotations to open it. You know how you have to rotate certain caps three or four whole times to get them open? This one doesn’t need more than a quick twist.

Minor usage tips

  • You’ll want to use your body weight when you’re pressing the filter, especially when using the top-of-the-line Travel filter, which has more resistance than the other filter options. As mentioned, find a low coffee table, or a sturdy chair, or just kneel down and press against the ground, rather than using a high countertop.
  • When pressing the filter, or removing the inner cup from the outer cup to fill it up again, open the lid just a bit. This will let the air escape, so you’re not fighting against a vacuum.
  • When you’re pressing the filter, leave the cap on, but open slightly, so you don’t get your hands on the rim where your lips will go.
  • If you take it on a plane, the air inside the bottle will be under a higher pressure than the air inside the cabin, which can force the seal open. So when you get up into the air, just open the lid, and close it again. That’ll equalize the pressure. You can also empty it out before you fly, so there’s no water to leak out (remove the inner cup from the outer cup and empty both, as there’ll be a bit of moisture in the pre-filter area as well), or, alternatively, you can fill it up all the way, so there’s little or no air inside that can change pressure. Fun physics fact: Liquids don’t change much in response to pressure.
  • When you’re removing the inner cup from the outer cup, twist it a bit, instead of just pulling it straight out. It’ll come out more easier.

Final thoughts!

As you can tell, I’m quite happy with this. The one and only potential problem with the original design was the weight, which has been completely solved. The filtration performance is up there with the best filters you can possibly find, and even beats several of the more famous options out there, often by a lot. Better yet, this fits into a bottle you can take with you anywhere, with no dangly hoses, no pumping, no sucking, no squeezing, no lightbulb shining, no battery switching, no waiting half an hour for iodine tablets to work, and no iodine flavor when you’re done waiting. Just fill, press, and drink.

In the last few years, certain worthy competitors have halted operations, while several others have been shown to have wildly unrealistic marketing claims, and some continue to be inexplicably famous despite their insufficient performance. And, in the same time period, we’ve had lead poisoning scares, E. Coli outbreaks, and other nuisances that most filters were not designed to solve. They even treated the E. Coli outbreak with chlorine, and then the water tasted like chlorine. Great!

Grayl is one of the inexplicably few options that can handle all these contaminants (and pesky viruses), with removal rates as good as anything you’ll find, combined with unrivaled ease of use and portability. And by swapping out the filters according to what level of filtration you need, you can use it at home, in the woods, or in remote villages in developing nations. In other words: Anywhere.

Now that there’s a lightweight version at half the weight (and a lower cost), there’s just no down side. This is coming with me wherever I go.

Head over to check it out.

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